SLDP

SEC source: 0001880162-24-000002 · primary_doc.xml · nonDerivative · entry 1

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 543,933

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 1, 2023 (the "10b5-1 Plan") for a stock option award set to expire on March 20, 2025. The 10b5-1 Plan is structured to include several sale periods and was established to cover the reporting person's tax liability arising from the option exercises and for longer-term asset diversification.

SEC source: 0001880162-24-000001 · primary_doc.xml · derivative · entry 3

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,816,079

Underlying: Common Stock · 187,500 shares

Expires 2025-03-20

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 1, 2023 (the "10b5-1 Plan") for a stock option award set to expire on March 20, 2025. The 10b5-1 Plan is structured to include several sale periods and was established to cover the reporting person's tax liability arising from the option exercises and for longer-term asset diversification.

SEC source: 0001880162-24-000001 · primary_doc.xml · nonDerivative · entry 2

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 356,433

F2 · shares: This sale was made pursuant to the 10b5-1 Plan.

F3 · price: This transaction was executed in multiple trades at prices ranging from $1.255 to $1.34. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001880162-24-000001 · primary_doc.xml · nonDerivative · entry 1

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 543,933

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 1, 2023 (the "10b5-1 Plan") for a stock option award set to expire on March 20, 2025. The 10b5-1 Plan is structured to include several sale periods and was established to cover the reporting person's tax liability arising from the option exercises and for longer-term asset diversification.

SEC source: 0001880162-23-000004 · primary_doc.xml · derivative · entry 2

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,003,579

Underlying: Common Stock · 150,000 shares

Expires 2025-03-20

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001880162-23-000004 · primary_doc.xml · nonDerivative · entry 1

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 356,433

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001880162-23-000003 · primary_doc.xml · derivative · entry 3

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 3,153,579

Underlying: Common Stock · 187,500 shares

Expires 2025-03-20

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 1, 2023 (the "10b5-1 Plan") for a stock option award set to expire on March 20, 2025. The 10b5-1 Plan is structured to include several sale periods and was established to cover the reporting person's tax liability arising from the option exercises and for longer-term asset diversification.

SEC source: 0001880162-23-000003 · primary_doc.xml · nonDerivative · entry 2

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 206,433

F2 · shares: This sale was made pursuant to the 10b5-1 Plan.

F3 · price: This transaction was executed in multiple trades at prices ranging from $1.42 to $1.538. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001880162-23-000003 · primary_doc.xml · nonDerivative · entry 1

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 393,933

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The transactions reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 1, 2023 (the "10b5-1 Plan") for a stock option award set to expire on March 20, 2025. The 10b5-1 Plan is structured to include several sale periods and was established to cover the reporting person's tax liability arising from the option exercises and for longer-term asset diversification.

SEC source: 0001879989-23-000002 · primary_doc.xml · nonDerivative · entry 1

Goldberg Steven H · CIK 0001879989 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,197

F1 · kind: The sale was made to generate proceeds to cover the reporting person's tax liability arising from the vesting of restricted stock units.

F2 · price: This transaction was executed in multiple trades at prices ranging from $1.48 to $1.495. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001104659-23-079232 · tm2320785-3_4seq1.xml · nonDerivative · entry 1

Awada Kaled · CIK 0001751431 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106,315

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest in 12 equal installments commencing on August 15, 2023 and then quarterly thereafter on February 15, May 15, August 15, and November 15 of each year, subject to the reporting person continuing to be a service provider (as defined in the Solid Power, Inc. 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001104659-23-079233 · tm2320785-4_4seq1.xml · nonDerivative · entry 1

Kreh Susan M · CIK 0001393657 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106,315

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest in 12 equal installments commencing on August 15, 2023 and then quarterly thereafter on February 15, May 15, August 15, and November 15 of each year, subject to the reporting person continuing to be a service provider (as defined in the Solid Power, Inc. 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001317458-23-000007 · primary_doc.xml · derivative · entry 2

Van Scoter John C. · CIK 0001317458 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,904,016

Underlying: Common Stock · 1,904,016 shares

Expires 2033-06-14

F2 · derivative.exercise_date: The stock option will vest as to 25% of the shares of the Issuer's common stock underlying the grant on June 14, 2024, and will vest as to the remaining 75% of the shares underlying the grant in 12 equal quarterly installments commencing on June 30, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Solid Power, Inc. 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001317458-23-000007 · primary_doc.xml · nonDerivative · entry 1

Van Scoter John C. · CIK 0001317458 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,035,276

F1 · shares: Each restricted stock unit represents a contingent right to receive one share of the underlying common stock of the Issuer. The restricted stock units will vest as to 25% of the granted number on June 14, 2024, and the remaining 75% of the granted number will vest in 12 equal quarterly installments commencing on June 30, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Solid Power, Inc. 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001891897-23-000007 · primary_doc.xml · nonDerivative · entry 1

Liebscher James · CIK 0001891897 · Chief Legal Officer & Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 348,548

F1 · shares: Represents shares of the issuer's common stock withheld to satisfy the reporting person's tax obligation upon the vesting of restricted stock units.

SEC source: 0000899243-23-013986 · doc4.xml · nonDerivative · entry 2

ANDERSON ERIK J · CIK 0001174968 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By WestRiver Management, LLC and affiliates

Disclosed balance after: 693,900

F2 · shares: By WRG DCRC, LLC ("WRG DCRC"), of which WestRiver Management, LLC ("WestRiver Management") is the sole managing member. The Reporting Person is the sole member and sole manager of WestRiver Management. As a result, the Reporting Person may be deemed to beneficially own the securities held of record by WRG DCRC. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein.

F3 · ownership.nature: Represents 187,617 shares owned directly by WestRiver Management and 506,283 shares owned directly by WRG INV41, LLC ("WRG INV41"). WestRiver Management is the sole managing member of WRG INV41. The Reporting Person is the sole member and sole manager of WestRiver Management. As a result, the Reporting Person may be deemed to beneficially own the securities held of record by WestRiver Management and WRG INV41, LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein.

SEC source: 0001903970-23-000001 · primary_doc.xml · nonDerivative · entry 1

Roe Lesa B · CIK 0001903970 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,776

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the 2021 Solid Power, Inc. Equity Incentive Plan) through such vesting date.

SEC source: 0001879989-23-000001 · primary_doc.xml · nonDerivative · entry 1

Goldberg Steven H · CIK 0001879989 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,897

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the 2021 Solid Power, Inc. Equity Incentive Plan) through such vesting date.

SEC source: 0001891897-23-000005 · primary_doc.xml · nonDerivative · entry 1

STEPHENS JOHN JOSEPH · CIK 0001258391 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,897

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the 2021 Solid Power, Inc. Equity Incentive Plan) through such vesting date.

SEC source: 0001891897-23-000006 · primary_doc.xml · nonDerivative · entry 1

Wright Mary Ann · CIK 0001354116 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,424

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the 2021 Solid Power, Inc. Equity Incentive Plan) through such vesting date.

SEC source: 0001891897-23-000004 · primary_doc.xml · nonDerivative · entry 1

Miziolek Aleksandra A · CIK 0001599142 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,756

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the 2021 Solid Power, Inc. Equity Incentive Plan) through such vesting date.

SEC source: 0000899243-23-013986 · doc4.xml · nonDerivative · entry 1

ANDERSON ERIK J · CIK 0001174968 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,197

F1 · shares: Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the 2021 Solid Power, Inc. Equity Incentive Plan) through such vesting date.

SEC source: 0001882289-23-000002 · primary_doc.xml · nonDerivative · entry 1

Johnson Derek Colby · CIK 0001882289 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 332,629

F1 · shares: Represents shares of the issuer's common stock withheld to satisfy the reporting person's tax obligation upon the vesting of restricted stock units.

SEC source: 0001882291-23-000002 · primary_doc.xml · nonDerivative · entry 1

Jansen David B · CIK 0001882291 · Director · President; Interim CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 757,102

F1 · shares: Represents shares of the issuer's common stock withheld to satisfy the reporting person's tax obligation upon the vesting of restricted stock units.

SEC source: 0001880162-23-000002 · primary_doc.xml · nonDerivative · entry 1

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 206,433

F1 · shares: Represents shares of the issuer's common stock withheld to satisfy the reporting person's tax obligation upon the vesting of restricted stock units.

SEC source: 0001738972-23-000002 · primary_doc.xml · nonDerivative · entry 1

Paprzycki Kevin A. · CIK 0001738972 · CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 287,628

F1 · shares: Represents shares of the issuer's common stock withheld to satisfy the reporting person's tax obligation upon the vesting of restricted stock units.

SEC source: 0001891897-23-000003 · primary_doc.xml · nonDerivative · entry 1

Liebscher James · CIK 0001891897 · Chief Legal Officer & Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 361,284

F1 · shares: Represents shares of the issuer's common stock withheld to satisfy the reporting person's tax obligation upon the vesting of restricted stock units.

SEC source: 0000899243-23-012852 · doc4.xml · nonDerivative · entry 1

ANDERSON ERIK J · CIK 0001174968 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By WestRiver Management, LLC and affiliates

Disclosed balance after: 695,801

F1 · kind: Pro rata distribution without consideration by WRG DCRC Investors, LLC ("WRG DCRC Investors") to its members ("In-Kind Distribution").

F2 · ownership.nature: Represents 1,901 shares owned directly by WRG DCRC, LLC ("WRG DCRC"), 187,617 shares owned directly by WestRiver Management, LLC ("WestRiver Management") and 506,283 shares owned directly by WRG INV41, LLC ("WRG INV41") after giving effect to the In-Kind Distribution. WestRiver Management is the sole managing member of WRG DCRC and WRG INV41. The Reporting Person is the sole member and sole manager of WestRiver Management. As a result, the Reporting Person may be deemed to beneficially own the securities held of record by WestRiver Management, WRG DCRC and WRG INV41, LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein.

SEC source: 0001891897-23-000002 · primary_doc.xml · nonDerivative · entry 1

STEPHENS JOHN JOSEPH · CIK 0001258391 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by LP

Disclosed balance after: 300,005

F1 · price: This transaction was executed in multiple trades at prices ranging from $2.8582 to $2.9757. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001882289-23-000001 · primary_doc.xml · derivative · entry 2

Johnson Derek Colby · CIK 0001882289 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 549,023

Underlying: Common Stock · 549,023 shares

Expires 2033-03-02

F2 · derivative.exercise_date: The stock option will vest as to 25% of the shares of the Issuer's common stock underlying the grant on March 2, 2024, and will vest as to the remaining 75% of the shares underlying the grant in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001882289-23-000001 · primary_doc.xml · nonDerivative · entry 1

Johnson Derek Colby · CIK 0001882289 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 342,288

F1 · shares: Each restricted stock unit represents a contingent right to receive one share of the underlying common stock of the Issuer. The restricted stock units will vest as to 25% of the granted number on March 2, 2024, and the remaining 75% of the granted number will vest in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001882291-23-000001 · primary_doc.xml · derivative · entry 3

Jansen David B · CIK 0001882291 · Director · President; Interim CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,454,434

Underlying: Common Stock · 1,454,434 shares

Expires 2033-03-02

F2 · derivative.exercise_date: The stock option will vest as to 25% of the shares of the Issuer's common stock underlying the grant on March 2, 2024, and will vest as to the remaining 75% of the shares underlying the grant in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001882291-23-000001 · primary_doc.xml · nonDerivative · entry 1

Jansen David B · CIK 0001882291 · Director · President; Interim CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 767,450

F1 · shares: Each restricted stock unit represents a contingent right to receive one share of the underlying common stock of the Issuer. The restricted stock units will vest as to 25% of the granted number on March 2, 2024, and the remaining 75% of the granted number will vest in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001880162-23-000001 · primary_doc.xml · derivative · entry 2

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 349,089

Underlying: Common Stock · 349,089 shares

Expires 2033-03-02

F2 · derivative.exercise_date: The stock option will vest as to 25% of the shares of the Issuer's common stock underlying the grant on March 2, 2024, and will vest as to the remaining 75% of the shares underlying the grant in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001880162-23-000001 · primary_doc.xml · nonDerivative · entry 1

Buettner-Garrett Joshua · CIK 0001880162 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 211,952

F1 · shares: Each restricted stock unit represents a contingent right to receive one share of the underlying common stock of the Issuer. The restricted stock units will vest as to 25% of the granted number on March 2, 2024, and the remaining 75% of the granted number will vest in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001738972-23-000001 · primary_doc.xml · derivative · entry 2

Paprzycki Kevin A. · CIK 0001738972 · CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 476,031

Underlying: Common Stock · 476,031 shares

Expires 2033-03-02

F2 · derivative.exercise_date: The stock option will vest as to 25% of the shares of the Issuer's common stock underlying the grant on March 2, 2024, and will vest as to the remaining 75% of the shares underlying the grant in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001738972-23-000001 · primary_doc.xml · nonDerivative · entry 1

Paprzycki Kevin A. · CIK 0001738972 · CFO & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 295,907

F1 · shares: Each restricted stock unit represents a contingent right to receive one share of the underlying common stock of the Issuer. The restricted stock units will vest as to 25% of the granted number on March 2, 2024, and the remaining 75% of the granted number will vest in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001891897-23-000001 · primary_doc.xml · derivative · entry 2

Liebscher James · CIK 0001891897 · Chief Legal Officer & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 444,296

Underlying: Common Stock · 444,296 shares

Expires 2033-03-02

F2 · derivative.exercise_date: The stock option will vest as to 25% of the shares of the Issuer's common stock underlying the grant on March 2, 2024, and will vest as to the remaining 75% of the shares underlying the grant in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0001891897-23-000001 · primary_doc.xml · nonDerivative · entry 1

Liebscher James · CIK 0001891897 · Chief Legal Officer & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 367,148

F1 · shares: Each restricted stock unit represents a contingent right to receive one share of the underlying common stock of the Issuer. The restricted stock units will vest as to 25% of the granted number on March 2, 2024, and the remaining 75% of the granted number will vest in 12 equal quarterly installments commencing on March 31, 2024, and thereafter at the end of each fiscal quarter of the Issuer, subject to the reporting person continuing to be a service provider (as defined in the Issuer's 2021 Equity Incentive Plan) through the applicable vesting date.

SEC source: 0000899243-23-002786 · doc4.xml · derivative · entry 5

LEUSCHEN DAVID M · CIK 0001222726 · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 7,256,959

Underlying: Common Stock, par value $0.0001 per share · 20,528 shares

Expires 2026-12-08

F7 · price: The price reported in Column 8 of Table II is a weighted average price. The warrants were sold in multiple transactions at prices ranging from $0.65 to $0.67, inclusive. The reporting persons will provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, information regarding the number of warrants sold at each price within the range.

F2 · ownership.nature: DCRC Sponsor is the record holder of these securities. David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Holdings LLC, which controls DCRC Sponsor.

F5 · ownership.nature: Each of Mr. Leuschen and Mr. Lapeyre may be deemed to have or share beneficial ownership of the securities held directly by DCRC Sponsor, REL Batavia Partnership, LP and Riverstone SP Partners, LLC. Each such person disclaims any such beneficial ownership of such securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose.

SEC source: 0000899243-23-002786 · doc4.xml · nonDerivative · entry 1

LEUSCHEN DAVID M · CIK 0001222726 · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Decarbonization Plus Acquisition Sponsor III LLC

Disclosed balance after: 4,738,454

F1 · kind: On January 26, 2023, Decarbonization Plus Acquisition Sponsor III LLC ("DCRC Sponsor") distributed 3,651,546 shares of common stock, par value $0.0001 ("Common Stock"), of Solid Power, Inc. (the "Issuer") to its members pro rata.

F1 · price: On January 26, 2023, Decarbonization Plus Acquisition Sponsor III LLC ("DCRC Sponsor") distributed 3,651,546 shares of common stock, par value $0.0001 ("Common Stock"), of Solid Power, Inc. (the "Issuer") to its members pro rata.

F2 · ownership.direct: DCRC Sponsor is the record holder of these securities. David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Holdings LLC, which controls DCRC Sponsor.

F5 · ownership.direct: Each of Mr. Leuschen and Mr. Lapeyre may be deemed to have or share beneficial ownership of the securities held directly by DCRC Sponsor, REL Batavia Partnership, LP and Riverstone SP Partners, LLC. Each such person disclaims any such beneficial ownership of such securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose.

SEC source: 0000899243-23-004120 · doc4.xml · nonDerivative · entry 1

ANDERSON ERIK J · CIK 0001174968 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By WRG DCRC Investors, LLC

Disclosed balance after: 1,008,759

F1 · kind: Pro rata distribution without consideration from Decarbonization Plus Acquisition Sponsor III LLC to its members, including WRG DCRC Investors, LLC ("WRG DCRC Investors").

F2 · ownership.nature: WestRiver Management, LLC ("WestRiver Management") is the sole managing member of WRG DCRC Investors. The Reporting Person is the sole member and sole manager of WestRiver Management. As a result, the Reporting Person may be deemed to beneficially own the securities held of record by WRG DCRC Investors. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein.

SEC source: 0000899243-23-002786 · doc4.xml · derivative · entry 4

LEUSCHEN DAVID M · CIK 0001222726 · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 7,277,487

Underlying: Common Stock, par value $0.0001 per share · 89,866 shares

Expires 2026-12-08

F6 · price: The price reported in Column 8 of Table II is a weighted average price. The warrants were sold in multiple transactions at prices ranging from $0.65 to $0.75, inclusive. The reporting persons will provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, information regarding the number of warrants sold at each price within the range.

F2 · ownership.nature: DCRC Sponsor is the record holder of these securities. David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Holdings LLC, which controls DCRC Sponsor.

F5 · ownership.nature: Each of Mr. Leuschen and Mr. Lapeyre may be deemed to have or share beneficial ownership of the securities held directly by DCRC Sponsor, REL Batavia Partnership, LP and Riverstone SP Partners, LLC. Each such person disclaims any such beneficial ownership of such securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose.

SEC source: 0001879903-22-000004 · primary_doc.xml · nonDerivative · entry 3

Campbell Douglas M · CIK 0001879903 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,700,214

F1 · kind: The proceeds of these sales will be used primarily to cover the reporting person's tax liability arising from option exercises.

F4 · price: This transaction was executed in multiple trades at prices ranging from $6.405 to $6.69. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001879903-22-000004 · primary_doc.xml · nonDerivative · entry 2

Campbell Douglas M · CIK 0001879903 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,870,214

F1 · kind: The proceeds of these sales will be used primarily to cover the reporting person's tax liability arising from option exercises.

F3 · price: This transaction was executed in multiple trades at prices ranging from $6.55 to $6.865. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001891897-22-000004 · primary_doc.xml · nonDerivative · entry 1

STEPHENS JOHN JOSEPH · CIK 0001258391 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by LP

Disclosed balance after: 85,505

F1 · price: This transaction was executed in multiple trades at prices ranging from $6.74 to $6.82. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001879903-22-000004 · primary_doc.xml · nonDerivative · entry 1

Campbell Douglas M · CIK 0001879903 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,070,214

F1 · kind: The proceeds of these sales will be used primarily to cover the reporting person's tax liability arising from option exercises.

F2 · price: This transaction was executed in multiple trades at prices ranging from $6.635 to $6.955. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001879903-22-000003 · primary_doc.xml · nonDerivative · entry 2

Campbell Douglas M · CIK 0001879903 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,270,214

F1 · kind: The proceeds of these sales will be used primarily to cover the reporting person's tax liability arising from option exercises.

F3 · price: This transaction was executed in multiple trades at prices ranging from $6.75 to $7.02. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001879903-22-000003 · primary_doc.xml · nonDerivative · entry 1

Campbell Douglas M · CIK 0001879903 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,530,214

F1 · kind: The proceeds of these sales will be used primarily to cover the reporting person's tax liability arising from option exercises.

F2 · price: This transaction was executed in multiple trades at prices ranging from $6.935 to $7.29. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001879903-22-000002 · primary_doc.xml · nonDerivative · entry 2

Campbell Douglas M · CIK 0001879903 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,780,214

F1 · kind: The proceeds of these sales will be used primarily to cover the reporting person's tax liability arising from option exercises.

F3 · price: This transaction was executed in multiple trades at prices ranging from $6.47 to $7.35. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.